{"id":"F2006B09233","name":"AD/DHC-8/75 - Cabin Exhaust Foam Air Filters","slug":"ad-dhc-8-75-cabin-exhaust-foam-air-filters","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53121,"registerId":"commonwealth-F2006B09233-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/DHC-8/75 Cabin Exhaust Foam Air Filte","sectionType":"part","heading":"AD/DHC-8/75 Cabin Exhaust Foam Air Filters 12/2000","content":"# AD/DHC-8/75 Cabin Exhaust Foam Air Filters 12/2000\n\nApplicability: DHC-8 Series 100, 200 and 300 aeroplanes, serial numbers 408, 413 and 434 to 507,\n\nexcept 464, 490 and 506.\n\nRequirement: Replace any foam air filters (part number 600048) or alternate foam air filters, installed in the cabin exhaust system, in accordance with Bombardier Repair Drawing RD8-21-23, Issue 2, dated 16 December 1999. (Available from Bombardier Aerospace).\n\nNote: Transport Canada airworthiness directive CF-2000-25 refers.\n\nCompliance: Unless previously accomplished, within 4 months after the effective date of this airworthiness directive.\n\nThis Airworthiness Directive becomes effective on 30 November 2000.\n\nBackground: Bombardier has found that foam filters were erroneously incorporated into some production aeroplanes. Foam filters do not in comply with applicable flammability standards.\n\n![](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 11 October 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 1 November 2000.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD's scope aligns with its stated purpose: it targets specific serial-numbered DHC‑8 aircraft fitted with foam cabin exhaust filters that fail flammability standards and mandates their replacement per Bombardier instructions. It does not expand obligations beyond that corrective action or broaden applicability beyond the listed aircraft and part number."},"complexity_factors":["Narrow applicability: specific aircraft series and listed serial numbers limit affected population.","Single, discrete action required: replacement of a specific part number (P/N 600048) or equivalent.","External technical reference: work must follow Bombardier Repair Drawing RD8‑21‑23 (document procurement/interpretation needed).","Short compliance window: four months may require expedited parts sourcing and maintenance scheduling.","Identification/inspection burden: operators must verify serial numbers and installed part numbers to determine applicability.","Regulatory provenance: issued under subregulation 39.1(1) of CAR 1998 and cross-references Transport Canada AD CF-2000-25."],"plain_english_summary":"**This Airworthiness Directive orders replacement of cabin exhaust foam air filters (P/N 600048 or equivalents) on specified DHC‑8 Series 100/200/300 aircraft, using Bombardier Repair Drawing RD8‑21‑23, because the foam filters do not meet flammability standards.** The work must be completed within four months; operators must obtain and install the approved parts per the Bombardier drawing and meet the compliance cost. The AD is issued under subregulation 39.1(1) of CAR 1998 to correct the unsafe condition."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific manufacturing defect in specific aircraft serial numbers, requiring a single replacement action. There is no evidence of scope creep — the instrument remains tightly focused on the original safety issue identified by the manufacturer."},"complexity_factors":["Very short document (approximately 250 words)","Only 3 defined elements: specific aircraft models, specific part number, and specific repair drawing reference","Single straightforward requirement with no conditional logic or exceptions","No cross-references to other legislation (only a non-binding note about a Canadian equivalent directive)","Clear, fixed compliance deadline with simple 'unless already done' exception","Narrow applicability (specific serial numbers with explicit exclusions)"],"plain_english_summary":"Mandatory safety order requires owners/operators of De Havilland Canada DHC‑8 Series 100/200/300 (serials 408, 413 and 434–507, excluding 464, 490, 506) to replace foam cabin-exhaust filters (PN 600048 or equivalent) that were wrongly fitted in production and fail fire-safety standards. Replacement must follow Bombardier repair drawing dated 16 December 1999.\n\nDeadline: within four months of 30 November 2000 (by 31 March 2001) unless already corrected. This averts a cabin fire hazard and is legally binding."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-75-cabin-exhaust-foam-air-filters","history":"/api/acts/ad-dhc-8-75-cabin-exhaust-foam-air-filters/history","analysis":"/api/acts/ad-dhc-8-75-cabin-exhaust-foam-air-filters/analysis","conflicts":"/api/acts/ad-dhc-8-75-cabin-exhaust-foam-air-filters/conflicts","importantCases":"/api/acts/ad-dhc-8-75-cabin-exhaust-foam-air-filters/important-cases","documents":"/api/acts/ad-dhc-8-75-cabin-exhaust-foam-air-filters/documents"}}